Limestone pulverizer



Jan. 6, 1942. `H, N, EDENs Er AL 2,268,860.

LIMESTONE PULVERIZER H. N. EDENS ET AL 2,268,860

LIMESTONE PULVERIZER Filed Dec. 1, 1959 2 sheets-sheet 2 'I Jan. 6, 1942.

ww hw QN 9m; uw v .wm s N m Si @ww hw NM, Nk, NN M .6. K. ww Y Y www .W Sw [Q h w. 4 ww .NN I l|| I Sw .vm E 1% mm Nw l/ Nw mun.\ Nw l Nm mm A www a, Law. GNV) QW u, QM ww HH ww 3 wm Patented Jan. 6, 1942 UNITED STATESg n. PATENT OFFICE LIMESTONE PULVEBJZER Engine Co., Freeport, Ill., a corporation of lilinois Application December 1, 1939, Serial No. 337,0@

18 Claims.

This invention relates to machines especially designed for pulverizing limestone but of course adapted for pulverizing other similar materials.

The principal object of our invention is to provide a pulverizer in which virtually al1 of the internal surfaces that are subjected to wear and tear in the operation of the machine are provided on replaceabley liners which are furthermore quickly and easily accessible for removal and replacement, all of these liners being of hardened steel' with a view,toward increased eilciency of operation as well as greater durability.

Another important object of the invention lies in the use of a standard sized crossbar of rectangular cross-section as replaceable liners on all of the peripheral surfaces in the machine so that the user can purchase a quantity of thesel rip-rap, the bars in the throat and screen portions being placed with only their longitudinal edge portions exposed, but being placed throughout the rest of the machine with their broad sides exposed, and the bars being placedwith their broad sides in engagement for the throat portion and being placed with their broad sides in spaced relation for the screen portion, while in the rip-rap portion the bars are placed edge to edge but in such angular relationship that a saw tooth effect is obtained. Provision is also made in the throat portion for supporting the bars in stacked relation and so that the bars may be crowded tightly together to present a fairly smooth flat inner throat surface. Other provision is made for securing tight engagement between the liner bars of the rip-rapped portion and thesaw tooth peripheries of the replaceable side liner plates.

The invention is illustrated in the accompany- `ing drawings, in which- Figure 1 is a vertical section through a pulverizer made in accordance with our invention;

Fig. 2 is a transverse section taken substantially on the line 2-2 of Fig. 1, looking in the direction indicated by the arrows;

Fig. 3 is a developed sectional view on the line 3-3 of Fig. l showing all of the liner bars in plan view;

Fig. 4 is a perspective of one of the spacers used in the screen portion of the machine;

Fig. 5 is a perspective view of an end portion of one of the concave housing plates used in the rip-rap portion of the machine; and

Fig. 6 is a perspective of one of the adjacent replaceable side liner plates.

The same reference numerals are applied to corresponding parts throughout the views.

Referring to the drawings, the housing of the machine comprises a number of sections 1, 8, 9, Ill, II, I2, I3, and I4 assembled together between parallel end plates Il so as to form a generally cylindrical housing for the rotary hammer assembly. The sections II and I2 donot extend the length of the housing, like the other sections mentioned, so that said cylinder is provided with a large open bottom. This is clearly shown in Fig. 2. Ears I5 are formed integral with each section and there are nuts I6 on bolts I1 extended through holes in said ears and through holes in the end plates I8 serving to secure the parts together. Wear plates or liner members I9, 20, 2I, and 22 are fastened to the inside of the end plates by means or nuts 23 and bolts 24.

The hardened steel liner hars 25 provided in accordance with our invention are all of identical shape and size and hence are interchangeable. In the throat portion 25 of the housing the bars 25 are set on edge with relation to the hammer assembly and stacked in the recesses 26a and i 2Gb in housing sections I3 and I4. These bars collectively provide a smooth inner throat surrface which will not wear quickly. The set screws 21 which are spaced longitudinally of the top of the stack of bars crowd the bars tightly together-against the ilange 28 on section I3. A wedge-shaped piece 29 betweenk those bars in section I3 and those in the angularly related section I4 transmits the pressure from the upper group to the lower group. The we'ar plates I9 and 22 overlapping the ends of these bars keep them in place. l

The lower portion 30 of the housing is constructed to provide a screen. Here the bars 25 `stand on edge on the inner` edges of the housing sections II, I2, and on narrow extensions on the opposite ends of section I3, separated by means the end plates I8 and each has a laterally projecting ear 34 integral therewith. At each 'end of the inner member 33 is an outwardly projecting ear 35 stationed above the other ears 34. Bolts 31 extend through holes in the ears 34 and 35 and have nuts 36 threaded thereon which when tightened cause the parts ot the entire screen portion 3l to be drawn tightly together between the housing sections III and I3. The inner surface of member 33 serves also as a support for liner bars 25, the latter being set broad side to the hammer assembly as shown. and retained by the wear plates 2| which overlap the opposite ends of said bars.

At 38 is indicated what we call the rip-rap portion of the housing in which the bars 25 are disposed broad side to the hammer assembly but in angular relationship to one another. 'I'he bars are held at their ends between the stepped inner periphery 8a on the housing sections 8 and 9 and the stepped outer periphery 28a of the Wear plates 28. The breadth and depth of the individual steps are made to accommodate the,

bars 25, as shown. The liner bars 25 cooperating with the housing section 1 are retained in position between that section and the wear plates I9 which overlap their end portions.

In operation, the limestone or other material to be pulverized is delivered into the throat portion of the housing through the inlet opening 40 from the chute 40a. The rotating hammer assembly in the housing acts to crush the stone between the hammers and the liner bars 25 until the pieces are sufciently small to pass out through the screen section 38. The rotating hammer assembly comprises a heavy drive shaft 4| which passes through the housing and is supported in bearings as shown, and has a iiywheel 1I fixed on one end and a drive pulley 12 iixed on the other end to permit belt drive. The shaft 4l has the hammer iiang'es 43, 44, 45, and

46 keyed thereon as indicated at 42. `Each of said hammer flanges consists of a relatively broad collar surrounding shaft 4| and having a circumferential flange on one side thereof. Each of said hammer anges 43, 44, 45, and is of substantially clover leaf form providing three c ircumferentially spaced recesses 41, 48, and 49. The hammers 5U, 5l, and 52, which are provided with concave or recessed outer faces 53, 54, and 55, are mounted on the aforesaid flanges by means of pairs of pintles 56, 51, and 58, and cotter pins shown entered in holes in the opposite ends thereof, the pintles being passed through holes in the arms 59, 60, and 6|. Other holes 66, 61, and 68 are provided farther from center to receive the pintles when the hammers are to operate on a larger radius. The construction of the hammer assembly permits hammers 56,51, and 52 to swing in a wider arc than would otherwise be possible, and also permits the hammers to work closer to the shaft 4| in the event that tools or any abnormally hard materials or extra large stones are introduced into the machine by accident.

In order that easy access may be had to the interior of the housing of the machine, the riprap portion of the housing is so constructed and mounted as to constitute a door 13. 'I'he door 13 has the segmental side plates .|811 forming the side portions thereof and it therefore opens substantially all of the way to the shaft 4I. 'I'he plates I8a carry the wear plates 28 and hence when the door 13 is opened all of the bars 25 of the rip-rap portion are exposed. The door 13 is pivotally attached to the remainder of the machine by means of knuckles 14 and pintles 15.

The said door 13 is retained in a closed position 25 when reversed will expose for wear the opporsi;- site unworn edge or broad face, as the case ma'yf'. be. Thus in the strainer portion where one edge of a bar wears away at a time, three new settings are possible before the bar is no longer usable there. Moreover, inasmuch as all of the peripheral lining bars 25 are identical they may be in-l terchanged, so that when a bar has become so worn on both usable surfaces that it is no longer eilicient in one portion of the housing in which it has been employed, it may still be usable in some other portion where the requirements are different. For example, after the bars in portions 36 and 26 of the housing have become worn on their edges, they may still be employed in the rip-rap section 36 where their broad surfaces are exposed; similarly some of the worn bars 25 from the rip-rap section 38 may be subsequently employed in sections 26 and 30, depending on how they have worn. When a bar is no longer usable in any section, it is a simple and inexpensive matter to replace it. Opening. of the door 13 also gives access to the hammers 50, 5|, and 52 for -purposes of reversing or replacing them. After the surfaces receiving the brunt of the wearwith the hammers in the positions shown in the drawings have become badly worn, the rst step is to change the hammers end for end. When the newly exposed surfaces also have become worn, the pintles 56,51, 58 maybe mounted in the other holes 66, 61, and 68 whereby the worn hammers are caused to rotate on a longer radius. The said hammers may also be reversed end for end in the holes 66, 61, and 68 when that becomes n It is believed the foregoing description conveys a good understanding of the objects and advantages of my invention. The appended claims have been drawn with a view to covering all legitimate modiiications and adaptations.

We claim:

1. In a machine of the prising a rotary hammer assembly operable on a substantially'horizontal axis, and a generally cylindrical-shaped housing to enclose said hammer assembly in substantially concentric relation therewith, said housing having an open throat portion opening into the top at one side thereof, said housing being defined by opposed end walls spaced by intermediate peripheral walls in transverse relation thereto, replaceable liner means for said housing comprising a plu rality of hardened steel liner bars all of substantially identical elongated rectangular crosssection and of substantially the same length, whereby the liner bars for one portion of said housing are interchangeable with liner bars in any other portion of said housing, means for supporting in one side of the throat portion of the housing a first series of said bars in stacked relationship and broadside abutment with one another exposing their inner longitudinal edge portions toward the hammer assembly, said edge portions together smooth inner surface for said throat portion,

class described, comaaeeeoA v l I l 3 means for lsupporting in1the lower portion of said, housing a second series of said bars with the broad sides of neighboring bars in spaced relation to one another and with -their inner longitudinal edge portions exposed at substan- 5 tially the same radial distance from the hammer assembly, the last named series of bars forming a screen portion for said housing, and means for supporting in the upper portion of said housing on the opposite side from the rst series of bars a third series of said bars with their broad sides exposed toward the hammer assembly, said bars of the last mentioned'series having their longitudinal-edge portions in radially offset relationship to one another and so that all of the bars of that series are disposed at substantially the same radial distance from the hammer assembly. 2. A machine as set forth in claim 1, including still other means for supporting another plu- 2o rality of said bars in said housing between the second and third series of bars with their broad Isides exposed toward the hammer assembly and spaced radially outwardly with respect thereto.

3. A machine as set forth in claim 1, including still other means for supporting 4another plurality of said bars in said housing between the second and third series of bars with their broad sides exposed toward the hammer assembly'and spaced radially outwardly with respect thereto,

and another means for supporting others of said bars in said housing between the third serl of bars and the throat portion of the housing with their broad sides exposed toward the hammer assembly and spaced radially outwardly with respect thereto.

4. In a machine of the class described, comprising a rotary hammer assembly operable on a. substantially horizontal axis, and a generally cylindrical-shaped housing to enclose said ham-,40

mer assembly in substantially concentric relation therewith, said housing having an open throat portion opening into the top at one side thereof, said housing being defined by opposed end walls spaced by intermediate peripheral walls in transverse relation thereto, replaceable liner means for said housing comprising a plurality of hardened steel liner bars all of substantially identical elongated rectangular cross-secf tion and of substantially the same length, whereby the liner bars are interchangeable, means for supporting in one side of the throat portion of the housing a rst series of said bars in stacked relationship and broadside abutment with one another exposing their inner longitudinal edge portions toward the hammer assembly, said edge portions vtogether providing a substantially smooth inner surface for said throat portion, means for supporting in the upper portion of said housing on the' opposite side-from w the first seriesof bars another series of said bars with their broad sides exposed toward the hammer assembly, said bars lof the last mentioned series having their longitudinal edge portions in radially offset relation to one another and so mer assembly in substantially concentric rela- 'l5 tionv therewith, said housing having an open throat portion opening into the top at one side thereof, said housing being defined by opposed end walls spaced by intermediate peripheral walls in transverse relation thereto, replaceable liner means for `said housing comprising a plurality of hardened steel liner bars all of substantially identical elongated rectangular crosssection and of substantially thev samev length, whereby the liner bars are interchangeable, means for supporting in one side of the throat portion of the housing a rst series of y said bars in stacked relationship and broadside abutment with one another exposing their inner longitudinal edge portions toward the hammer assembly,

. said edge portions together providing va substan- I tially smooth inner surface for said throat portion, and means for supporting in the lower portion of said housing a second series of said bars with the broad sides of neighboring bars in spaced relation, to one another and with their inner longitudinal edge portions exposed at substantially the same radial distance from the hammer assembly, the last named series of bars forming a screen portion for said housing.

6. In a machine of the class described, comprising a rotary hammer assembly operable on a substantially horizontal axis, and a generally cylindrical-shaped housing to enclose said hammer assembly in substantially concentric relation therewith, said housing having an open throat portion opening into the top at one side thereof, said housing being defined by opposed end walls spaced byr intermediate peripheralwalls in transverse relation thereto, replaceable liner means for said housing comprising a plurality of hardened steel liner bars all of substantially identical elongated. rectangular cross-section and of substantially the same length, whereby the liner bars are interchangeable, means for supporting in the lower portion of said housing a series of said bars with their inner longitudinal edge portions exposed ltoward the hammer assembly and spaced to form a screen portion for said h'ousing, and means for supporting in the upper portion of said housing on one side of the throat portion another series of said bars with their broad sides exposed toward the hammer assembly, said bars of the last mentioned series having their longitudinal edge portions in radially offset relationship to one another and so that all of the bars of that series are disposed at substantially the same radial distance from vthe hammer assembly.

'1. A machine as set forth in claim 1, wherein the supporting means associated with each of the three series of bars is constructed to permit removal and reversal of the bars to expose unworn portions thereof toward the hammer assembly after the bars become worn in their originally assembled positions in the machine.

8. A machine as set forth in claim 4, wherein the supporting means associated with each of the two series of bars is constructed .to permit removal and reversal of the bars to expose unworn portions thereof toward the hammer assembly after the bars become worn in their originally assembled positions in the machine.

9. A machine as set forth 'in claim 5, wherein the supporting means associated with each of the two series of bars is constructed to permit removal and reversal of the bars to expose unworn portions thereof toward thehammer assembly after the bars become worn in their originally asl sembled positions in themachine.

10. A machine as set lforth in claim 6, wherein the supporting means associated with each of the two series of bars is constructed to permit removal and reversal of the bars to expose un- Wom portions thereof toward the hammer assembly after the bars become worn in their originally assembled positions in the machine.

11. In a, machineof the class described, comprising a rotary hammer assembly operable on a substantially horizontal axis, and a generally cylindrical-shaped housing to enclose said hammer assembly in substantially concentric relation therewith; said housing having an open throat portion opening into the top at one side thereof, said housing being defined by opposed end walls spaced by intermediate peripheral walls in transverse relation thereto, replaceable liner means for said housing comprising a. plurality of elongated hardened steel liner bars all of substantially identical elongated regular rectangular cross-section and of substantially the same length, means for demountably supporting in the bottom of the housing a. series of said -bars to form a screen portion with the bars in circumferentially spaced relation disposed edgewise in substantially radial planes with respect to th'e hammer assembly exposing inner longitudinal edge portions toward said hammer assembly, and means for demountably supporting in one side of the throat portion of Ithe housing another series of said bars to form a renewable wall lining wherein the bars are in stacked relationship and broadside abutment with one another exposing their inner longitudinal edge portions toward the hammer assembly, said edge portions together providing a substantially smodth inner surface for said throat portion, both of the bar supporting means being constructed to permit removal and reversal of th'e bars to expose unworn edge portions thereof toward the hammer assembly after the bars become worn in :their originally assembled positions in the machine, the bars in the screen portion being interchangeable with bars in the renewable wall lining.

12. In a machine of the class described, comprising a rotary hammer assembly operable on a substantially horizontal axis, and a generally cylindrlcal-shaped housing to enclose said hammer assembly in substantially concentric relation therewith, said housing having an open throat portion opening into the top at one side thereof, said housing -being deiined by opposed end walls spaced by intermediate peripheral walls in trans- .verse relation thereto, replaceable liner means for said housing comprising'a plurality of elon-` gated hardened steel liner bars all of substantially identical elongated regular rectangular cross-section and of substantially the same length, means for demountably supporting in the bottom of the housing a series of said bars to form a screen portion with the bars in circumferentially spaced relation disposed'edgewise in substantially radial planes with respect to the hammer assembly exposing inner longitudinal edge portions toward said hammer assembly, and means for demountably `supporting in th'e upper portion of said housing on one side of the throat portion another series of said bars to form a riprap portion wherein the bars are disposed with their broad sides exposed toward the hammer assembly, said` bars of the last named series having their longitudinal edge'portions in radially oifset relationship to one another and so that all of 'the bars of that series are disposed at substantially the same radial distance from th'e hammer constructed to permit removal and reversal of the bars to expose unworn edge and face portions thereof toward the hammer assembly aiter the bars become worn in their originally assembled positions in the machine, the bars inA the screen portion being interchangeable with bars in the rip-rap portion.

13. In a machine of the class described, comprising a rotary hammer assembly operable on a I substantially h'orizontal axis, and a. generally cy- -lindrical-shaped housing to enclose said hammer l assembly in substantially concentric relation therewith, said housing having an open throat portion opening into the top at one side thereof, said housing being defined by opposed end walls spaced by intermediate peripheral walls in transverse relation thereto, replaceable wear plates removably secured on the inner sides of said end walls inthe throat portion, the peripheral wall of said housing being formed to provide a recess along one side of said throat portion, the opposite en'ds of which are overlappedv by the edges of said wear plates, liner bars of substantially rectangular cross-section and substantially the same length disposed in stacked relationship in said recess and removably held in place at their ends by said plates so as to provide by their exposed inner longitudinal edge portions collectively a renewable throa't surface renewable by reversal and replacement of bars when they become worn, and a screen bottom for the housing formed by a series of liner bars identical with the last named liner bars and demountably supported in circumferentially spaced relation in the bottom of the housing, th'e bars in the screen portion being interchangeable with bars in said stacked group.

14. In a machine of the class described, comprising a rotary hammer assembly operable on a substantially horizontal axis, and a generally cylindrical-shaped housing to enclose said hammer assembly in substantially concentric relation therewith, said housing having an open throat portion opening into the top at one side thereof, said housing being dened by opposed end walls spaced by intermediate peripheral Walls in transverse relation thereto, said-end walls including opposed separate segmental-shaped end plates for the upper portion of the housing on one side of the throat and said peripheral walls including 'a separate peripheral plate connecting said end plates to forman upper housing section movable relative to the rest of the housing and having means for removably securing the same in assembled relationship thereto, replaceable wear plates removably secured on the inner sides of said end plates and formed to provide recesses in the outer peripheral portion th'ereof for the retention of liner bars, and liner bars of substantially rectangular cross-section and substantially the same length disposed with their broad sides exposed inwardly toward the hammer assembly and with their longitudinal edge portions in radially offset relation to one another and so that all of the bars are at substantially the same radial distance from the hammer assembly, the ends of the bars being entered in the recesses of said wear plates for support of the bars in the posito provide one side of the recesses for reception of assembly, both of the bar supporting means Ibeing tions described, the bars collectively providing a renewable rip-rap surface in said housing renewable by reversal and replacement of bars when they become worn. the peripheral edge portion of the wear plate being of saw-toothed form the ends of the liner bars and the inner side of the peripheral plate being of complementary saw-'toothed form to provide the other side of the recesses.

15. In a machine of the class described, comprising a rotary hammer assembly operable on a substantially horizontal axis, and a generally cylindrical-shaped housing to enclose said hammer assembly in substantially concentric relation therewith, said housing having an open throat portion opening into the top at one side thereof, said housing being defined by opposed end walls spaced by intermediate peripheral walls in transverse relation thereto, replaceable liner means for said housing comprising a plurality of elongated hardened steel liner bars all of substantially identical'elongated regular rectangular cross-sec'tion and of substantially the same length', means for demountably supporting in one side of the throat portion of the housing a series of said bars to form a renewable wall lining, wherein the bars are in stacked relationship and broadside abutment with one another exposing only their inner longitudinal edge portions toward the hammer assembly, said edge portions together providing a substantially smooth inner surface for said throat portion, and means for demountably supporting in the upper portion of said housing on the opposite side of the throat portion another series of said bars to form a rip-rap portion wherein the bars are disposed with their broad sides `exposed toward the hammer assembly, said bars having their longitudinal edge portions in radially offset relationship to one another and so that all of the bars of that series are disposed at substantially the same radial distance from the hammer assembly, both of the bar supporting means being constructed to permit removal and reversal of th'e bars to expose unworn edge and face portions toward the hammer assembly after the bars become worn in their originally assembled positions in the machine, the bars in the renewable wall lining being interchangeable with bars in the rip-rap portion.

16. A machine as set forth in claim 15, including means for demountably supporting in the bottom of the housing a series of said bars to form a screen portion with the bars in circumferentially spaced relation, disposed edgewise in substantially radial planes relative to the hammer assembly, exposing inner longitudinal edge portions toward said hammer assembly, the bars in the screen portion being interchangeable with bars in the renewable wall lining and rip-rap portions.

17. A machine as set forth in claim 15, including means forA demountably supporting in the bottom of the housing a series of said bars to form a screen portion with the bars in circumferentially spaced relation, disposed edgewise in substantially radial planes relative to the hammer assembly, exposing inner longitudinal edge portions toward the hammer assembly, the bars in the screen portion being interchangeable with bars in the renewable wall lining and rip-rap portion, the peripheral wall of said housing between the screen and rip-rap portions being recessed and receiving in said recessed portion one or more of said bars with their broad side faces exposed 'toward the hammer assembly to form a. renewable Wall lining, the last named bars being interchangeable with bars in the rip-rap and screen portions and renewable wall lining first named.

18. A machine as set forth in claim 15, including means for demountably supporting in the bottom of the -housing a series of said bars to form a screen portion withv the bars in circumferentially spaced relation, disposed edgewise in substantially radial planes relative to the hammer assembly, exposing inner longitudinal edge portions toward said hammer assembly, the bars in the screen portion being interchangeable with bars in the renewable wall lining and rip-rap portions, the peripheral wall of said housing between the screen and rip-rap portions and between the rip-rap portion and the throat portion being recessed and receiving in each of said recessed portions one or more of said bars with their broad side faces exposed toward the hammer assembly to form renewable wall linings, the last named bars being interchangeable with bars in the riprap and screen portions and renewable wall lining HENRY N. EDENS. CLARENCE B. MOLTER. 

